<template>
  <div class="upload-box">
    <el-upload
      ref="uploadImage"
      v-model:file-list="_fileList"
      action="#"
      list-type="picture-card"
      :class="['upload', self_disabled ? 'disabled' : '', drag ? 'no-border' : '']"
      :multiple="true"
      :disabled="self_disabled"
      :limit="limit"
      :http-request="handleHttpUpload"
      :before-upload="beforeUpload"
      :on-exceed="handleExceed"
      :on-success="uploadSuccess"
      :on-error="uploadError"
      :drag="drag"
      :accept="fileType.join(',')"
    >
      <div class="upload-empty">
        <slot name="empty">
          <el-icon><Plus /></el-icon>
        </slot>
      </div>
      <template #file="{ file }">
        <img :src="file.url" class="upload-image img-cropper" :alt="file.name" :id="file.uid" />
        <div class="upload-handle" @click.stop>
          <div v-if="!self_disabled" class="handle-icon" @click="openDialog(file)">
            <el-icon><Delete /></el-icon>
            <span>裁剪</span>
          </div>
          <div class="handle-icon" @click="handlePictureCardPreview(file)">
            <el-icon><ZoomIn /></el-icon>
            <span>查看</span>
          </div>
          <div v-if="!self_disabled" class="handle-icon" @click="handleRemove(file)">
            <el-icon><Delete /></el-icon>
            <span>删除</span>
          </div>
        </div>
      </template>
    </el-upload>
    <div class="el-upload__tip">
      <slot name="tip"></slot>
    </div>
    <el-image-viewer
      v-if="imgViewVisible"
      :url-list="[viewImageUrl]"
      @close="imgViewVisible = false"
    />

    <!--  图片裁剪  -->
    <el-dialog
      :title="state.dialogTitle"
      :width="state.dialogWidth"
      v-model="state.isShowDialog"
      :before-close="closeDialog"
    >
      <div
        v-if="imageSrc"
        style="display: flex; justify-content: space-between; align-items: center"
      >
        <!-- Display cropped image or original image if not cropped with background -->

        <div
          style="
            width: 50%;
            padding: 10px;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
          "
        >
          <img
            ref="previewImage"
            :src="croppedImageSrc || imageSrc.toString()"
            alt="Preview Image"
            style="max-width: 100%; height: auto"
          />
        </div>

        <!-- Upload image section without background -->
        <div
          style="
            width: 50%;
            padding: 10px;
            display: flex;
            justify-content: center;
            align-items: center;
          "
        >
          <img
            ref="uploadImage"
            :src="imageSrc.toString()"
            alt="Source Image"
            style="max-width: 100%; height: auto"
          />
        </div>
      </div>

      <!-- Centered buttons -->
      <div v-if="imageSrc" style="margin-top: 20px; text-align: center">
        <el-button type="primary" @click="rotateLeft(-5)">左转</el-button>
        <el-button type="primary" @click="rotateRight(5)">右转</el-button>
        <el-button type="primary" @click="changeScale(0.1)">放大</el-button>
        <el-button type="primary" @click="changeScale(-0.1)">缩小</el-button>
        <el-button type="warning" @click="cropImage">裁剪图片</el-button>
        <el-button type="success" @click="uploadCroppedImage">确定上传</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script setup lang="ts" name="UploadImgs">
  import { ref, computed, inject, watch, reactive, nextTick, onMounted } from 'vue';
  import { Delete, Plus, UploadFilled, ZoomIn } from '@element-plus/icons-vue';
  import { uploadImg } from '/src/views/system/upload';
  import {
    UploadProps,
    UploadFile,
    UploadUserFile,
    UploadRequestOptions,
    ElMessage,
  } from 'element-plus';
  import { ElNotification, formContextKey, formItemContextKey } from 'element-plus';

  interface UploadFileProps {
    fileList: UploadUserFile[];
    drag?: boolean; // 是否支持拖拽上传 ==> 非必传（默认为 true）
    disabled?: boolean; // 是否禁用上传组件 ==> 非必传（默认为 false）
    limit?: number;
    fileSize?: number; // 图片大小限制 ==> 非必传（默认为 5M）
    fileType?: any[]; // 图片类型限制 ==> 非必传（默认为 ["image/jpeg", "image/png", "image/gif"]）
    height?: string; // 组件高度 ==> 非必传（默认为 150px）
    width?: string; // 组件宽度 ==> 非必传（默认为 150px）
    borderRadius?: string; // 组件边框圆角 ==> 非必传（默认为 8px）
  }
  const props = defineProps({
    modelValue: {
      type: String,
      default: '',
    },

    fileList: {
      type: Array<UploadUserFile>,
      default: () => [],
    },
    // 是否支持拖拽上传 ==> 非必传（默认为 true）
    drag: {
      type: Boolean,
      default: true,
    },
    // 是否禁用上传组件 ==> 非必传（默认为 false）
    disabled: {
      type: Boolean,
      default: false,
    },
    limit: {
      type: Number,
      default: 1,
    },
    fileSize: {
      type: Number,
      default: 5,
    },
    fileType: {
      type: Array,
      default: () => ['image/jpeg', 'image/png', 'image/gif'],
    },
    height: {
      type: String,
      default: '150px',
    },
    width: {
      type: String,
      default: '150px',
    },
    borderRadius: {
      type: String,
      default: '8px',
    },
    cropperWidth: {
      type: Number,
      default: 400,
    },
    cropperHeight: {
      type: Number,
      default: 400,
    },
  });
  const emit = defineEmits<{
    'update:modelValue': [value: string];
    success: [value: any];
  }>();
  // 获取 el-form 组件上下文
  const formContext = inject(formContextKey, void 0);
  // 获取 el-form-item 组件上下文
  const formItemContext = inject(formItemContextKey, void 0);
  // 判断是否禁用上传和删除
  const self_disabled = computed(() => {
    return props.disabled || formContext?.disabled;
  });
  // 默认回显图片
  const _fileList = ref<UploadUserFile[]>([]);
  // 在组件挂载后执行一些逻辑
  onMounted(() => {
    _fileList.value.push({ url: props.modelValue, name: props.modelValue.length + '' });
    // 可以在这里执行初始化逻辑，比如获取数据等
  });

  watch(
    () => props.modelValue,
    (n: string) => {
      // eslint-disable-next-line no-console
      console.log('update:modelValue', n);
    }
  );

  /**
   * @description 文件上传之前判断
   * @param rawFile 选择的文件
   * */
  const beforeUpload: UploadProps['beforeUpload'] = (rawFile) => {
    const imgSize = rawFile.size / 1024 / 1024 < props.fileSize;
    const imgType = props.fileType.includes(rawFile.type);
    if (!imgType) {
      ElNotification({
        title: '温馨提示',
        message: '上传图片不符合所需的格式！',
        type: 'warning',
      });
    }
    if (!imgSize) {
      setTimeout(() => {
        ElNotification({
          title: '温馨提示',
          message: `上传图片大小不能超过 ${props.fileSize}M！`,
          type: 'warning',
        });
      }, 0);
    }
    return imgType && imgSize;
  };

  /**
   * @description 图片上传
   * @param options upload 所有配置项
   * */
  const handleHttpUpload = async (options: UploadRequestOptions) => {
    let formData = new FormData();
    formData.append('file', options.file);
    try {
      const { data } = await uploadImg(formData);
      options.onSuccess(data);
    } catch (error) {
      options.onError(error as any);
    }
  };

  /**
   * @description 图片上传成功
   * @param response 上传响应结果
   * @param uploadFile 上传的文件
   * */

  const uploadSuccess = (response: { url: string } | undefined, uploadFile: UploadFile) => {
    if (!response) {
      return;
    }
    uploadFile.url = response.url;
    const imgs = _fileList.value.map((obj) => obj.url).join(',');
    emit('update:modelValue', imgs);
    emit('success', imgs);
    // 调用 el-form 内部的校验方法（可自动校验）
    // 调用 el-form 内部的校验方法（可自动校验）
    formItemContext?.prop && formContext?.validateField([formItemContext.prop as string]);
    ElNotification({
      title: '温馨提示',
      message: '图片上传成功！',
      type: 'success',
    });
  };

  /**
   * @description 删除图片
   * @param file 删除的文件
   * */
  const handleRemove = (file: UploadFile) => {
    _fileList.value = _fileList.value.filter(
      (item) => item.url !== file.url || item.name !== file.name
    );
    const imgs = _fileList.value.map((obj) => obj.url).join(',');
    emit('update:modelValue', imgs);
  };

  /**
   * @description 图片上传错误
   * */
  const uploadError = () => {
    ElNotification({
      title: '温馨提示',
      message: '图片上传失败，请您重新上传！',
      type: 'error',
    });
  };

  /**
   * @description 文件数超出
   * */
  const handleExceed = () => {
    ElNotification({
      title: '温馨提示',
      message: `当前最多只能上传 ${props.limit} 张图片，请移除后上传！`,
      type: 'warning',
    });
  };

  /**
   * @description 图片预览
   * @param file 预览的文件
   * */
  const viewImageUrl = ref('');
  const imgViewVisible = ref(false);
  const handlePictureCardPreview: UploadProps['onPreview'] = (file) => {
    viewImageUrl.value = file.url!;
    imgViewVisible.value = true;
  };

  // ====================== 裁剪 ======================
  import Cropper from 'cropperjs';
  import 'cropperjs/dist/cropper.css';
  const croppedImageSrc = ref(null);
  const imageSrc = ref<string | ArrayBuffer | null>(null);
  const uploadImage = ref(null);
  const uid = ref(0);
  // 自定义值
  const state = reactive({
    dialogWidth: '800px',
    dialogTitle: '图片裁剪上传',
    isShowDialog: false,
    cropperImg: '',
    cropperImgBase64: '',
    cropper: '' as RefType,
  });

  /**
   * 打开 裁剪图片
   * @param file
   */
  const openDialog = async (file: UploadFile) => {
    if (!file.url) return;
    uid.value = file.uid;
    imageSrc.value = file.url.toString();
    croppedImageSrc.value = null;
    state.dialogWidth = '60%';
    state.isShowDialog = true;
    await nextTick();
    initCropper(file);
  };

  /**
   * 关闭 裁剪图片
   *
   */
  const closeDialog = () => {
    state.isShowDialog = false;
  };
  /**
   * 裁剪初始化
   */
  const initCropper = (file: UploadFile) => {
    if (state.cropper) {
      state.cropper.destroy();
    }
    if (!uploadImage.value) return;
    state.dialogWidth = '60%';
    state.dialogTitle = '图片采集上传( ' + props.cropperWidth + ' x ' + props.cropperHeight + ' )';
    state.cropper = new Cropper(uploadImage.value, {
      aspectRatio: props.cropperWidth / props.cropperHeight, // 设置裁剪框的宽高比
      viewMode: 1, // 限制裁剪框不超过画布大小
    });
  };

  /**
   * 修改图片大小 正数为变大 负数变小
   * @param num
   */
  const changeScale = (num: number) => {
    num = num || 1;
    state.cropper.zoom(num);
  };
  /**
   * 向左边旋转90度
   * @param num
   */
  const rotateLeft = (num: number) => {
    num = num || 1;
    state.cropper.rotate(num);
  };
  /**
   * 向右边旋转90度
   * @param num
   */
  const rotateRight = (num: number) => {
    num = num || 1;
    state.cropper.rotate(num);
  };
  /**
   * 裁剪图片
   */
  const cropImage = () => {
    if (state.cropper) {
      const canvas = state.cropper.getCroppedCanvas({
        width: props.cropperWidth,
        height: props.cropperHeight,
      });
      // base64 格式
      croppedImageSrc.value = canvas.toDataURL('image/png');
    }
  };
  /**
   * 上传图片
   */
  const uploadCroppedImage = async () => {
    if (!croppedImageSrc.value) {
      ElMessage.error('请先裁剪图片');
      return;
    }
    try {
      const blob = dataURLToBlob(croppedImageSrc.value);
      const formData = new FormData();
      formData.append('file', blob, 'avatar.png'); // 注意这里的表单字段名应为'file'
      await uploadImg(formData).then((response) => {
        if (response.code === 200) {
          _fileList.value.forEach((item, index) => {
            if (item.uid === uid.value) {
              _fileList.value[index].url = response.data.url;
            }
          });
          const imgs = _fileList.value.map((obj) => obj.url).join(',');
          emit('update:modelValue', imgs);
          ElMessage.success('上传成功');
          state.isShowDialog = false;
        } else {
          ElMessage.error(response.data.msg || '上传失败');
        }
      });
    } catch (error) {
      ElMessage.error('上传失败');
    }
  };
  const dataURLToBlob = (dataURL: any) => {
    const arr = dataURL.split(',');
    const mime = arr[0].match(/:(.*?);/)[1];
    const bstr = atob(arr[1]);
    let n = bstr.length;
    const u8arr = new Uint8Array(n);
    while (n--) {
      u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], { type: mime });
  };
</script>

<style scoped lang="scss">
  .is-error {
    .upload {
      :deep(.el-upload--picture-card),
      :deep(.el-upload-dragger) {
        border: 1px dashed var(--el-color-danger) !important;
        &:hover {
          border-color: var(--el-color-primary) !important;
        }
      }
    }
  }
  :deep(.disabled) {
    .el-upload--picture-card,
    .el-upload-dragger {
      cursor: not-allowed;
      background: var(--el-disabled-bg-color) !important;
      border: 1px dashed var(--el-border-color-darker);
      &:hover {
        border-color: var(--el-border-color-darker) !important;
      }
    }
  }
  .upload-box {
    .no-border {
      :deep(.el-upload--picture-card) {
        border: none !important;
      }
    }
    :deep(.upload) {
      .el-upload-dragger {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 100%;
        padding: 0;
        overflow: hidden;
        border: 1px dashed var(--el-border-color-darker);
        border-radius: v-bind(borderRadius);
        &:hover {
          border: 1px dashed var(--el-color-primary);
        }
      }
      .el-upload-dragger.is-dragover {
        background-color: var(--el-color-primary-light-9);
        border: 2px dashed var(--el-color-primary) !important;
      }
      .el-upload-list__item,
      .el-upload--picture-card {
        width: v-bind(width);
        height: v-bind(height);
        background-color: transparent;
        border-radius: v-bind(borderRadius);
      }
      .upload-image {
        width: 100%;
        height: 100%;
        object-fit: contain;
      }
      .upload-handle {
        position: absolute;
        top: 0;
        right: 0;
        box-sizing: border-box;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 100%;
        cursor: pointer;
        background: rgb(0 0 0 / 60%);
        opacity: 0;
        transition: var(--el-transition-duration-fast);
        .handle-icon {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          padding: 0 6%;
          color: aliceblue;
          .el-icon {
            margin-bottom: 15%;
            font-size: 140%;
          }
          span {
            font-size: 100%;
          }
        }
      }
      .el-upload-list__item {
        &:hover {
          .upload-handle {
            opacity: 1;
          }
        }
      }
      .upload-empty {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 12px;
        line-height: 30px;
        color: var(--el-color-info);
        .el-icon {
          font-size: 28px;
          color: var(--el-text-color-secondary);
        }
      }
    }
    .el-upload__tip {
      line-height: 15px;
      text-align: center;
    }
  }
</style>
